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But when does the generation that began in 1965 end? 2035? or supposedly 2085? You said 70 years. But also possibly till 120 years. 

I think that's mistaken. The Church of Christ cannot cease to be Apostolic nor lose Her Apostolic Authority. This is clearly taught in the Catholic Encyclopedia. She will always have the Apostolic Mission, Ordinary Jurisdiction, and She will never defect. If all offices in the Church have defected to usurpers, the Church also has defected. Since that is impossible, it could not have taken place, and that explanation is false: Here is the CE on Apostolicity.

"Apostolicity is the mark by which the Church of today is recognized as identical with the Church founded by Jesus Christ upon the Apostles. It is of great importance because it is the surest indication of the true Church of Christ, it is most easily examined, and it virtually contains the other three marks, namely, Unity, Sanctity, and Catholicity ...

Apostolicity of mission is a guarantee of Apostolicity of doctrine. St. Irenæus (Adv. Haeres, IV, xxvi, n. 2) says: "Wherefore we must obey the priests of the Church who have succession from the Apostles, as we have shown, who, together with succession in the episcopate, have received the certain mark of truth according to the will of the Father; all others, however, are to be suspected, who separated themselves from the principal succession", etc. In explaining the concept of Apostolicity, then, special attention must be given to Apostolicity of mission, or Apostolic succession. Apostolicity of mission means that the Church is one moral body, possessing the mission entrusted by Jesus Christ to the Apostles, and transmitted through them and their lawful successors in an unbroken chain to the present representatives of Christ upon earth...

The history of the Catholic Church from St. Peter, the first Pontiff, to the present Head of the Church, is an evident proof of its Apostolicity, for no break can be shown in the line of succession. Cardinal Newman (Diff. of Anglicans, 369) says: "Say there is no church at all if you will, and at least I shall understand you; but do not meddle with a fact attested by mankind." ...

Regarding the Greek Church, it is sufficient to note that it lost apostolic succession by withdrawing from the jurisdiction of the lawful successors of St. Peter in the See of Rome. The same is to be said of the Anglican claims to continuity (MacLaughlin, "Divine Plan of the Church", 213; and, Newman, "Diff. of Angl.", Lecture 12.) for the very fact of separation destroys their jurisdiction. They have based their claims on the validity of orders in the Anglican Church. Anglican orders, however, have been declared invalid. But even if they were valid, the Anglican Church would not be Apostolic, for jurisdiction is essential to the Apostolicity of mission."

In many cases the saints and doctors of the Church show a parallel between Christ and His Bride, the Church.  I think the best theory I have ever heard of how the Restoration will happen is that it will happen through the Hand of God and not through normal means of mankind.  Most of mankind could not wrap their minds around the idea that Our Lord could die and still truly be God.  Hence He was abandoned by even most of those closest to Him.  If the apostles had known how Our Lord's Crucifixion would have been remedied by His Resurrection they would not have abandoned Him.  It was a matter of Faith and only Our Lady, Saint John and a few others remained faithful and trusting in Our Lord until the end.

In a similar way...  

The Church seems to have died.  Many say that therefore, Traditional Catholicism can never have been the True Faith.  I believe that it is a similar situation as with Our Lord's crucifixion.  God has concealed from us the means of how the Church will be ressurected.  It is not our job to try and find out what God has not revealed to us or argue about how or when the Church will be restored.  Our job is to keep the Faith and the traditions.  To watch and be faithful like Our Lady and Saint John until the day God rises the Church up again.

When Our Lord rose from the dead, people often did not recognize Him until the "breaking of the bread" which many understand to have been the Mass.  In a similar sense, it could be argued that when the Church is risen up again by God it will be by the True Form and Traditional Mass that It shall be recognized.

Come Holy Ghost and restore the Faith on earth!

Viva Cristo Rey!

The idea you describe here, where there is some sort of deadline that is rapidly approaching, after which it will be impossible to elect a pope, is simply not part of sedevacantist theory, nor do sedes believe in anything like that.

He likes to strawman sedevacantists.