Same here (30 now), and I'm dyeing my hair every month (1 day before going for a haircut, to be exact). I like looking younger myself, but I've also noticed a different perception from clients (I'm a freelancer). Got some grey showing in my full beard as well, and might dye it too once it bothers me. Dyeing takes about 45m in total, and is really good for a month if done around the time of haircuts. That's for short hair (2-7cm). I hate ordinary dye as it contains ammonia, but I found an ammonia-free foam application that works well. 45m and €8 per month is quite cheap to invest in (subjectively) better looks and improved confidence when talking to clients.