That's always an awkward feeling - when you have to tell a 40+ year old woman that she is past her 'best before' date and walk out on a potential appt. No matter how much experience a lady has, that can't be a good feeling each time it happens.
Honestly, I think women in their 30s are past their prime but it is too much trouble to look for younger ones, so we just accept 30 something women as being attractive enough to stay with.
In all seriousness, I think any woman past 22 is no longer what she once was. Sigh.