Define "millionaire". Gross assets? Net assets? Cash? Annual net income? I started investing at 25. I am 31 now and I am a "gross asset" millionaire. If I stop

Define "millionaire". Gross assets? Net assets? Cash? Annual net income? I started investing at 25. I am 31 now and I am a "gross asset" millionaire. If I stop investing any further and my portfolio maintains its current growth I'll be a net asset millionaire by 37. I won't become any kind of millionaire from my $100k a year salary alone...