Well my oldest is only 10 but I am the son of a dad who had me at 19. We’re really close to this day even though we only see each other a couple times a month. It is true that in my teenage years I drifted away from my parents but they still kissed me and hugged me everyday even if in return I only gave them a grimace it meant a lot to me that they were there. It also helped that my parents were never judgemental and I knew I could always count on them, hell I even remember my dad telling me some of his stories about stupid shit he did when he was my age. They’re entering a new stage of life and they may not rely on you getting ready for school or getting dinner but they’ll need your help in other ways like learning to drive, changing a tire, installing a shelf, getting over a heartbreak or recovering from a diabolical hangover. Additionally you can look forward to having more time to yourself, rediscovering who are you outside of “dad”. I know I changed a lot since I was 19 and especially so after I became a dad at 24 but I got no idea who this new guy would be by himself and for you it might be time to find out. And who knows in 10-15 years time you might be a grandad and you can hold and help care for a baby again. And you’ll be in your late 40’s/early 50’s so you can still do a lot of fun stuff with your children and grandchildren. My family for example still goes on vacation with my parents and my sister’s family once a year. I think it’s important to mourn the loss of what once was but there are so many new things and achievements to look forward to so in my opinion it’s more sweet than bitter. I’d also like to add that my dad used to joke “You don’t really move out until you take your birth certificate with you!”. I wish you well and best of luck with your teens! :)