Accidental children

I accidentally had a baby when I was 18. He has been adored for 24 years now and has a younger brother (who was much less of an accident!) When I give him a hug, I often tell him he that is my most favourite accident in the whole wide world.
So, everything happened the wrong way for me. Baby, house, another baby, career, dogs.
My partner and I never bothered to get married, even though it was frowned upon, because I had a fixed idea that you got married first. We had messed that part up. So now, after 27 years of togetherness, should I pop the question on February 29th?
What inspired this? My class of 6-7 year olds this morning. When I asked them why today was a special day, they all looked very puzzled and attempted a few random ideas. Then Harrison said with great authority, ‘It’s the day when the lady can ask a man to marry her!’
I probably won’t pop the question – I’m not sure I have the energy to go through the wedding process and I can just hear my dad’s Yorkshire lilt telling me it’s a bit bloomin’ late for all that! I’d love to know if anyone else has though!