As per my need if :-
1. Under 25years old will buy 1btc
2. Above 25yrs less than 50 yrs will buy half gold half btc
3. Above 50 years will buy only gold
1. Under 25years old will buy 1btc
2. Above 25yrs less than 50 yrs will buy half gold half btc
3. Above 50 years will buy only gold