Is it regret that makes you choke up from time to time?

As I'm getting older, I find that I tend towards the odd tear; the occasional (or sometime more frequent) tendency to choke up for familiar but not entirely understood reasons.

So, listening to Neil Young singing 'Copperline' on Jools' music program this evening, I felt a twinge of that emotional stuff; starting just below my throat and working its way to try and squeeze a little something from my tear ducts.

Why? Not clear why. Possible reasons might be a sense of loss, regret or nostalgia? A stress related thing? Old age turning me a bit foolish? half a bottle of wine and a large scotch? Some underlying realisation that I'm spinning my wheels?

Who can say. Nice song, though.