In which case I'd just ignore it and change the subject and see if he keeps repeating it..
Is he saying it in a moment of passion? Then I'd think he's just getting carried away. During those moments some people often say things they don't really mean
Now...if it's during a meal or a walk and he's looking straight into your eyes...well...then he must be getting serious !!
RE: Can females looks improve with age.
Thanks TomI meant to say *agree*