I am 25 but look 40 upwards - please what can I use to look younger?

Thank you for your question! It Is always good to see a skin
care specialist in your area. Getting a consultation will help you understand
your skin and what improvements can be made with different treatments and
lasers. Unfortunately, with darker skin types, many lasers are a contradiction.
Treatments such as Micro needling with PRP can improve collagen production and
texture problems. There are fillers and neuromodulators that can help with fine
lines and wrinkles in specific areas of the face. There are also products that
can help with under chin fat, such as Kybella. Combining any of the treatments
with the right skin care regimen will improve your skin’s elasticity, giving it
a refreshed young looking skin.

Based on your photo, I would disagree and say that you look great and not as old as you think you do. Regardless, I understand that everyone has things about themselves they do not like and there is no harm in improving. Due to the lighting I cannot tell if you skin is even toned or not, although it appears to be. From the photo alone I would say you could probably benefit from some filler - some injected into the nasolabial folds to soften them and a little under the eyes to lighten up the darkness and make you appear more awake and refreshed. These procedures are quick and easy but will need to be maintained around every 4-6 months. I would recommend an in person consultation with a board certified dermatologist or plastic surgeon to properly asses your face and skin and discuss your goals.