21year old bushmills Irish whiskey
Bushmills 21 year single malt – A limited number of 21 year bottles are made each year, and are matured in three different types of casks: first in American bourbon barrels and then in Spanish Oloroso sherry casks. Together it will total 19 years in these casks, after which it may lie in Madeira drums for a further two years until bottling.
This is an Irish whiskey I'd look at that if I was you.
Congratulation I'm sure she will love drinking it with you on her 21st.