How the limit is usually calculated — and what gets lost
Search this topic and you will find the limit framed almost everywhere as an exclusion: "at 65 only ten years left", "over 65 usually excluded". The calculation is done, throughout, from the age of the single — or the older — applicant.
But the rule has a second half, and it changes the result: not the average, not the older applicant — the younger borrower's age sets the term. A partner ten years younger brings ten more years of term. The payment drops accordingly — and that is often what makes the financing viable in the first place.
There is no lower age cut-off. The limit is pure arithmetic: 75 minus the younger borrower's age. In practice, only the minimum term of around ten years and the resulting payment stand in the way — not an age barrier.