Advice on something to hold for 15+ years

[MontereyRick]

I have 3 daughters; age 6(born in 96), age 4(born in 98) and age 2(born in 2000).

I am interested in buying some special wine to hold for many years to open for their respective special occasions (college graduations, engagements, weddings, presidential inauguarations, etc).

I'd like to keep it in the $40-$75bottle and have it be something in the bold red (Cab, Zin, Bordeaux) type. Can someone give me some ideas of wines that will age and be very, very good in the next 15 - 25 years? Thanks very much in advance.