To convert the height of a 3-meter elephant to feet, we can use the conversion factor:

1 meter = 3.28084 feet

So, to convert 3 meters to feet:

3 meters * 3.28084 feet/meter = 9.84252 feet

Therefore, a 3-meter elephant is approximately 9.84252 feet tall.

As for the height of a 5-year-old elephant, it can vary greatly depending on the species and individual growth rate. However, for context, African elephants (Loxodonta africana) can grow to be around 2.4 to 3 meters (8 to 10 feet) tall by the age of 5 years.