The 'pros' say 1-2 years. I have had one last 2 1/2 years. (note here...you CAN'T play with bettas!! Leave them alone, don't filter the water, they like 'old' water)
If they are not too old and the female is ready, then they will mate.
Betta fish grow paler and less active when they are sick or old.
A nine month old betta is already full grown, so yes.
A betta normally only lives 2-3 years, so it would be around 70 years old in "betta years".
A Male Betta will grow to about 2.5inches of body length and a Female will grow to about 2 inches of body length. A Betta is fully grown at about 6 to 8 months a Betta is very old at 30 to 36 months.
the size of it's fins and body
'I'm not 2 sure !
Signs of old age in betta fish may include decreased activity levels, slower movement, faded coloration, fin deterioration, and reduced appetite. It is important to monitor your betta fish closely for any changes in behavior or appearance as they age.
They can live up to 3 years.
Most likely. I would wait until the little betta is around 3 cm (3/4 inch) Make sure the betta's are the different sex because two males will fight (often until death)
A betta fish's color may fade due to stress, poor water quality, inadequate diet, or old age. It is important to ensure a clean and suitable environment for your betta to help maintain its vibrant colors.
There are half moon betta, delta betta, round tail betta, long tailed betta, crown tailed betta, king betta, and others I don't know of yet.