Quick look up on Amanda Holden's background.
She married her first DH (Les Dawson) when 24, split at 28, got back together, spilt for good at 30, divorced at 32, possibly aware it wasn't working for a few years before that, so at her 'prime motherhood' years, in a failing relationship and going through a divorce.
She had her first DC at 35 with her now DH, then a number of MCs, including a very late one, before having DC2 at 40, is lamenting wanting more DCs but accepting she's lucky to have the 2 she's got given her health problems. There's nothing to suggest if she'd started having DCs 5-10 years earlier she'd not have the same problems.
This sort of history is very common for the 'later mothers' I know, few were married in their early 20s but just left it while they built careers to start a family, most didn't meet their DHs until mid-late 30s. It's not like they were putting off motherhood, more not having DCs with unsuitable men.
Life is complicated, some people are lucky and meet 'the one' early on, for those who don't, or there's nothing wrong with still trying for DCs a little later.