XiCi is spot on. There are very few things proven to help with ageing and most of them aren't in expensive moisturisers.
SPF is far away the most important thing to stop it getting any worse.
Retinol is next - basically only thing that genuinely improves the structure of your skin and reduces collagen loss
Acids - AHA (glycolic and lactic) if dry skin, BHA (salicylic) if spotty - will help exfoliate making your skin look fresher and possibly also helping the structure of your skin.
Then you have anti-oxidants and Vit C for pigmentation (retinols also great for pigmentation), niacinamide, ceramides, peptides and that's about it.
Moisturisers and things like hyaluronic will help do a temporary plump up but nothing more long lasting.
However you do not have to spend a fortune to do this:
Cleanser - whatever you like
Acid toner - see numerous threads before. I'm spotty so like Paula's Choice 2% BHA or Clinique Mild Clarifying lotion. Mega budget version would be Clearasil pads.
Serum - Hylamide has hyaluronic + peptides, there's a good priced Vit C version. Aldi Lacura is v cheap but hyaluronic only.
Night time - retinol LRP Redermic R or Avene Ystheal
Moisturiser - day time any SPF of your choice. Night time I like Cerave for ceramides + niacinamide.
Not masses of product, nothing ££££, and includes everything proven to be helpful.