we do start out with (seemingly) a lot of time on our hands. we are completely oblivious that our time on this Earth has a limit. it is nice to be young, for those of us who are young...it ain't me! we waste a lot of time on things that don't really matter and won't matter in the end. in middle age, we spend in denial, unwilling to face old age is coming. that should be when we do the things on our bucket list. old age gets here before we know it, and have done few things on our list. somethings are impossible to do by now due to body replacements such as knees or shoulders. we just don't walk as fast. or bend as deep ect. in our old age, we realize we should have done certain things when we were younger.

I really like your poem because it made me think real hard. I liked these lines:

You were pretty young

now as age catches up
time is still a constant
but we change so much
it is a great poem, my friend!

*hugs, Cat

Yes, it does. You are right, we don't pay much mind to the passage of time because we don't understand that our time here on earth infinite. I wish that you had made more about: "kissing was then a new thing
. now it's just a routine"
it seems that many people, when they get older, just give little pecks or blow kisses at each other. I make it a point to give my wife five little kisses every night before I go to bed, always five! Sometimes, I get my little kisses early and I go back for five more. She will playfully say; "You already had your kisses" but I persist, and I get more! A little game and the romance still is there. Even though we are older now, and time weighs heavy on us, "we remember when". Thank you for bringing that back to me. ~ Geez.
.

The reflective nature of this is very well done!

A suggestion, couple the first line with the first line of the next real stanza, then a line break for stanza two. Would make a bit of form for this piece. This is very William Carlos Williams-like.