I'm a make up artist so I thought I'd give you some make up ideas to help look more youthful. Obviously having not met you, it's difficult to be specific but these are just some general tips that work quite well.
Use an illuminating moisturiser under your foundation or tinted moisturiser. Preferably one with a high SPF to prevent further skin ageing. Christian Dior do a really nice one in SPF35 with a bit of a 'glow' to it or something similar if that's a bit on the steep side.
Also, use a foundation or tinted moisturiser which isn't matte, definitely not powder foundations as they will make your skin look dull and lifeless. The look you want is plump and moist (oooeerr!). Use a cream blusher rather than a powder, this will look like a natural glow coming from within rather than dull powder on the skin. If you use powder, just use it with a brush and only on the T Zone and around eyes, leaving a glow to the cheeks.
If you only wear natural make up then a pale, slightly shimmery peach eyeshadow will brighten your eyes and also neutralize any redness or blueish colour on your lids which you can sometimes get from a lot of outdoorsy life. It's a common misconception, by those not confident with make up, that browns suit everyone and are a safe option. This is not true, they can actually be very draining if they don't suit you. It's best, if you like a natural make up, to think about what colours would appear naturally. Cheeks look best in the colour you would naturally flush after a walk in the fresh air (unless you have high colour of course!), lips look best, and youngest, one tone deeper that the natural colour that they are in a sheer or satiny finish. Again, sorry with the expensive recommendations, but if you don't wear lipstick, Christian Dior have a balm that reacts with your lips and brings out their natural colour. The more coats you apply, the more enhanced version of your natural colour they become.
If you live in an area where there is a MAC counter, Space NK or other make up artist brand it can be helpful to book in for a one to one session there. They charge about £20-25 to spend an hour with you showing you how to do your make up and advising you on what suits you and then the money is actually redeemable against what you spend on products too so if you were thinking of buying some new make up to freshen up your look that is a fun, informative and economical way of doing it. If you can be really organised you can even plan it for when you have a night out or special occasion
- you do need to book quite far ahead if it's a weekend.