Most common questions used to investigate
Does your guitar keep getting out of tune?
Is your guitar tone dull?
Are your guitar strings discolored or rusty?
Do your guitar strings feel stiff?
Do your guitar strings feel dirty?
Common conclusions
If your guitar keeps getting out of tune you should change your strings.
If your guitar tone is dull you should change your strings.
If your guitar strings are discolored or rusty you should change your strings.
If your guitar feel stiff you should change your strings.
If your guitar strings feel dirty you should change your strings.
Sorry, we were unable to identify if it's time to change your guitar strings.
References
https://www.stringjoy.com/5-signs-time-change-guitar-strings/
https://www.guitarworld.com/gear/when-change-your-guitar-strings
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