Questions & Answers about Mi hermana tiene seis años.
Why does the sentence use tiene instead of a word for 'is'?
Does the number seis need to change to match masculine or feminine words?
Why is it mi instead of mis?
How important is the squiggly line over the 'n' in años?
It is extremely important! The ñ is a separate letter in the Spanish alphabet, pronounced a bit like the 'ny' in 'canyon'. If you write anos with a regular 'n', it means a completely different (and inappropriate) body part instead of 'years'. Always remember the squiggly line (called a tilde) when talking about age!