Older mean how old. Stuttering raises steadily and reaches its peak effect in early to middle 20s. Right from mid 30s it's reduces more and in 40s ,most of stutterers gain enough maturity to never care for this prob and life gets better with family and kids. 18 to 32 is the age category one needs to take care of their health and mental strength and never say due attitude shud be instilled in that period." College period followed by new job and up to 10 years of your skillful experience in job" that's all . I promise from 40s life is yours.