Which falls back to, do they see you as a daddy figure bcoz you can provide good emotional support? So, truly ask yourself, what are you looking for. Someone young, innocent, someone you can control, someone who don't look down on you, someone who sees you as matured? Do you really think there are many in that age group will have the same interest and train of thoughts like a 40+ year old man? Some, but they are rare and few. Especially girls who are sociable with their own circle of friends of the same age group. The loner type, the shy type, these girls will like it if you give them attention.
Personally, I'd want a strong character if I was 40+ and moving up the corporate ladder or running my own business. I don't need emotional baggage at this point in my life, where my career is going well. This is partly because I'm very strong headed and need someone to match my aura, and not the other way around.
On surface, you'd look good to others. You gain confidence coz you have a much younger GF. And if you really can find someone who carries themselves truly well, someone who is at the top of their game, very focus, good on you. Otherwise, you're either stepping down to their level, or they rise up to your level. There is no in-between.
Now, if you're just one of the average joes out there, working a 9-5 job with not much of an ambition but just take 1 salary at a time, 1 year at a time, then that could be a possibility why looking for someone younger makes sense coz 40+ women who are established or doing well don't think you would be a good fit for them. Hence it's harder, because these group may want commitment fast due to their age.
Anyway, I'm just sharing my thoughts on mindset between 2 different age groups. Of course, if they're all just for fun, by all means. Who cares what others think. As long as you're having good time and not hurting anyone. F your peers

(note: the fact that you worry what your peers thinks about you is because you understand why they think the way they do, otherwise you wouldn't give a shit)
Exactly my point. Well, don't even say 40+, those 30+ who like earns more than me (cause of their job nature) naturally question why would they wanna choose me. I was like, isn't there compatibility? They went like, if whatever I can provide, they have more, why would they choose me? Compatibility, emotional support and whatever non tangible doesn't feed their tummy according to them. There's always a higher mountain thus these women have been psychologically altered to date up (Hypergamy) and don't bother settling for less. But they don't see the downside, a guy earning RM15k a month may not look at them at 35+ to 40s while they are still in delulu stage hoping a rich and stable man fall into their doorstep.