My first BJs were also by a much older woman.
When I was 18 I used to babysit for a family.
Since they sometimes came home really late and I didn't drive at the time, I would quite often just sleep there the night.
In fact, sometimes I would be asleep before they even got home.
One night I was asleep in bed when I felt someone touch me.
At first I thought it was just a dream but then, when I opened my eyes, I saw the mother sitting there at the end of my bed stroking my cock.
She then removed my pyjama trousers and took my cock into her mouth.
For a guy with approx zero sexual experience this was an amazing feeling and I didn't manage to hold on for very long. I just groaned and pumped her mouth full of my cum.
She swallowed every bit of it and then gave a towel just to wipe off any excess I had.
With that she just got up and left.
Neither of us said a word the whole time.
From then on almost every time I was there she would come in and give me a bj. This went on for about a year until I stopped babysitting for them - by then their oldest daughter was 15 and they felt ok leaving her at home with the younger ones.
Funnily enough, a few years later I actually dated the daughter so I got to compare the mum and daughter.