When I had DD1 in the early 90s, my NCT class had several women who had undergone multiple rounds of IVF before a pregnancy that had got to 32 weeks. Not one of them was over 25 and there was a minimum two year's wait before the local GPs would refer for fertility investigations, never mind actually having IVF. So they'd been married, tried for two years, got referred and waited for the appointment, then had multiple tests and procedures, then 3+ attempts (and gone through a lot of it again when they'd gone private after the 3rd try), all by 25.