The legal drinking age in many places e.g. Delhi, Mumbai is 25 (It's 30 in Wadhra district). And, the legal marital age is 21 for males and 18 for females.

Oh! You are a 18 year old girl, you sure can be trusted with marriage and having/raising a kid but you sure cannot be trusted with booze!!

This is an inappropriate analogy touted by many. Marriage and booze can't be equated. An over dose of booze might cause you to render harm to someone else, this cannot be said of marriage.

You may want to lower the drinking age but you need to come up with better reasons :) Also why shouldn't the drinking age be 15 or 13?

Marrying and having children before you are "ready" can adversely affect the children.

And, let's face it: Many young marriages are particularly bad matches due to the inexperience of the people involved.

In any case: I didn't know that there was a legal minimum age for marriage in India and I commend them for having it. Such a limit is an important progressive step for any country in which the parents are heavily involved in matchmaking.

I used the analogy because both entail responsibility.

I am not favoring increase or decrease of either age mandates, I am just commenting on the disparity, if one cannot be trusted to consume alcohol responsibly then should the same person be trusted to be responsible for another human life (marriage and raising a child).

i don't understand what logic or studies they referring while selecting the ages.

in germany you can drink at the age of 16, but smoke at the age of 18

Smoking is rather more addictive than alcohol.

what is the minimum age of voting in Germany?