If you enter a bus or restaurant in yoruba land and someone addresses you as "brother" (booda), you are still relatively young. If you are addressed as "uncle" (onkwu), you are probably in your 30s or approaching 40. If you hear "baba" (baabaa), run for your dear life, you are definitely an old man, and believe me, you can't deceive them. Wear studs, suspenders, or tattoos, after a minute look at you, what you will hear is, aahhr, "baabaaa".