I got on the bike for fun, then got back in the pool for fun, then one day thought hmmmmmm if I can bike and swim maybe I should just learn to run and do a tri - I did my first one when I turned 50 so both you and Alpine have LOTS of fun years ahead to do them.
Seriously if you have already been a swimmer even if you came in last at least you won't be starting from scratch and I think that would be the hardest thing to learn because it is technical.
For the running portion I like the Couch to 5 k program on coolrunning.com
I went by time not speed.
Good luck and let us all know how you are progressing. There are a lot of amazing women on here who were/are very supportive of me when I lept into the tri world.
and as an aside I am NOT nor ever have been what a person would call athletic (I was a band, theater, art kid
but I have learned w/ tris everyone is so supportive and encouraging that even if you are one of the "glad to just be here" kind you feel part of all the excitment.
I love them
It's about the journey and being in the moment, not about the destination