20's - Your hair looks nice and full because the cuticle layers are the thickest they will ever be. So now is the time to experiment with your hair because the strands show less damage. Your hair is able to with stand curling irons and flat irons . Make sure that you use a heat protectant and always keep the iron moving through your hair.
30's Your hair is growing very fast because of your estrogen levels which stimulate hairs to grow. You are probably gonna be looking for products to help control those wild unruly baby hairs around your hairline and in your crown area. Hairspray is gonna be your best friend if you have fine hair . You can spray some on a toothbrush and brush those hairs into place. If your hair is thick ,you will want to use a pomade or paste to control.-just simply apply it in the palm of your hands or finger tips and smooth it over. 
40's Your hormones have stabilized so you will produce less oils.now you can cut back on the shampooing. At this time your hair will really benefit from oil treatments. It would be good for you to use an hot oil treatment once or twice a week. For fine hair- apply oil at night , work it in well and come through.You can use a hot towel or shower cap and just shampoo in the morning. For thick hair - use it as a shine booster , dap in an amount as needed and style as normal.
50's There has been changes in your outer cuticle layer so your hair is easy to work with now! Its gonna blowout and curl easy. For easy on the go hair , steam rollers are gonna do it for you. Create volume with a nice set of steam rollers, make sure you are over directing the roller and bringing it back to the base of the section to achieve volume. For smooth volume -use large rollersand big sections, for curly volume -use medium rollers and smaller sections.
60's Your outer cuticle layer is finer now. Hair feels more softer but it is also more fragile...take care and be gentle. Your gonna look for a glaze to coat that outer layer to look fuller and shinier. You can go into the salon for a glaze and in between salon visits ,you can apply one at home . For straight hair - work it in dry and leave in for five mins then rinse. For curly hair - condition and rinse ,then apply glaze, comb through the curls , leave in for five mins and rinse.*Now you have it! keep your hair beautiful:) All textures are different and require different approaches..so when maintaining your healthy hair ...always do research and get advice from your stylist!
