My kids are grown up now, but there would have been an occasion that was the last time I picked them up, spoon fed them, changed their nappy, strapped them in a buggy, etc etc...
Isn't it odd that these things are mundane and insignificant at the time, and yet we don't realise when it's the very last time we'll do something, or remember when that was? And then suddenly it's years and years later...