Question 739963
On June 30th 1969, you were 5 days old:
{{{30-25=5}}}
0n July 24th 1969, you were 29 days old
{{{24 days +5days=29days}}}
and your brother was having his first birthday.
He was exactly {{{365days}}} old, because he had not lived through any leap day.
That day the difference in ages was
{{{365days-29days=highlight(336days)}}}.
The difference in ages continued to be 336days every day after that.
It had been and would be 336 days as long as you were both born and alive.