I thought I had years, at least 7! Before I had to start worrying about birthday parties and such. A 3yo at my DS's preschool came out today, ran straight into his Mums arms sobbing that 'johnnie' hadn't invited him to his party. I didn't even think they had birthday parties at this age! Now I'm wondering how many parties my DS hasn't been invited too and why.
I'm quite a rational person, but this little boy was so sad, they're too small and lovely to have deal with that (mum looked just as heartbroken) I doubt my DS would even understand the situation but still.