Hello there ,
Thanks for writing your query,
There is definitly no age limit for the orthodontic treatment but there are many other factors that has to be consider before treating orthodontic cases like periodontal status of the teeth , spacing between the teeth and etc.
Since you are 25 years of age you can go for orthodontic treatment consulting a orthodontist who can better examine your oral status and decide the treatment plan.
if there is little or no space available for the tooth movement , extraction of the premolars is considered to create space.
You may need to get an OPG radiograph and lateral cephalogram done for you which will show the exact position of the tooth, consult a dentist
and get the treatment done .
i hope this helps ,