haha, I literally posted this exact post the other day! my cut off is 37. I'm currently 28 and a half. If I haven't got a place to live, a partner, children, a relatively stable job I don't hate by then ( I currently have none of these things) then after this s probably too late ( I'm a female so my biological clock won't last much past this). I don't have a good relationship at all with my current family, nor am I particularly career-driven. So if I don't have a new family don't see much point in continuing past then. The partner part will be hard because I loved my ex so much and shared so much with him I honestly don't think I am capable of love like that again...and if I see him marry and have kids with someone else it will probably destroy me, but well, trying not to be closed-minded about it!!!!! If things are too disastrous or painful to handle before then, I have my SN already so I can go. But I feel as though 37 is quite a reasonable cut-off point.