Btw I hate the daily mail.
As a child of older parents, I wouldn't advise leaving it after 36.
You might think a pregnancy is doable, and no doubt it is, but actually as a child, there isn't very much going on in your teens when your parents are 65plus.
IME there's nothing nice about old parents - mine were fit and healthy until they weren't, one dead, and one needing a lot of help years before any of my friends' parents were even pensioners.
I decided to have my kids early, in my 20s, but that didn't happen (various reasons, including looking after old parents) Had my last at 36, no grand parents able to babysit as they are old or dead. It's not just youself you need to think about. Your kids need parents who can be there for them in later years to give a hand, and have a childhood with.
I'd say 36 as the cut off. Friends who have had their kids older are just wrecked, even years after the tough early years, they look old. You just don't bounce back.
And I feel for their kids who will have old fogeys as parents, and may spend their twenties looking after them, as I did.
Just my perspective. And did I mention I hate the daily mail.