I am not aware of goldfish stopping growing at any specific age. They can get very large (over 24 inches) in the twenty or so years I have known them to live.
21 years old is when your body stop growing.
Normally before 18 years old. But it really depends. Your ears and noses never stop growing.
Your feet normally stop growing when you are between sixteen and eighteen years old.
21
Of course, whereas blacks never stop growing.
Most young Women stop growing at the age of 17-18 years.
it matters how old you are
8yrs old
when you are 20 yrs old
A boar will normally stop growing at the age of two years. However some don't stop growing until they are five years old, but it depends on the breed.
Wouldn't recommend putting a goldfish in a 5 gallon tank-regardless of what type or size of goldfish. This is because the goldfish would be stunted causing it to have an untimely death. The condition in which a goldfish is "stunted" is where the fish adjusts to its tiny environment so much as to stop growing. The fish will stop growing on the outside but will continue to grow on the inside. Goldfish are naturally messy and create a LOT of waste. This factor would cause the tanks water to be poluted which inturn could kill not only the goldfish but possible your mollies too :(. Two mollies is enough for a five gallon tank. If you truly want to get a goldfish you will have to house the goldfish in a 10-20 gallon tank with very good filtration
If the goldfish eggs appear "fuzzy" then they are growing fungus.