lossing some fat

Do you think fat burners suitable for all age level? Do they have age limit or any age level can use it? the main reason I asked so is sometimes I feel certain brand of fat burners not suit me as I cannot see the effect, no matter how precise I follow their instruction. Other than, most of us concern about the side effect of fat burners too. Just like how we worry of diet pills. Haha…with so much of concern, who dare to try the products now? Anyway, I still think that if many reviewers had gave good reviews about one particular, then no harm to give it a try!