It was interesting, although I don't think I agree with her.
I was a young mother - pregnant with DS1 at 20, then DD less than 2 years later. And I was clueless, and a crap, unhappy mother (in hindsight). I was a better mother (with younger DCs) when I was a lot older - more confident, more mature, less selfish.
She makes the teenage mums having buggy races sound like a bed of roses, and I'm quite sure it's not.