Which serum is best for older skin?

Good day, could you please clarify for me which serum among the various options available on the market would be the most beneficial for individuals with older skin? I'm particularly interested in the ingredients that are most effective in addressing common concerns such as wrinkles, fine lines, and loss of elasticity. Is there a particular brand or type of serum that you would recommend, and what sets it apart from the rest? Additionally, are there any potential side effects or precautions that one should be aware of when using such products? Thank you for your assistance.