It is permissible to dye hair any colour apart from black, and there is no differentiation in this regard between old men and young men. So, it is halal to dye your hair red and yellow, but there are some guidelines to keep in mind, such as not imitating people who are evil and disbelievers. Please read below for details.

Clipping the nails is Sunnah, and it is recommended to start with the right hand, then the left, then the right foot then the left.