Gnomes have an average life span of around 350 (200 + 3d100), but could live as long as 500 for some extreme cases.
40-50 would be around 125 or so for a gnome.
On the other hand, several spells age the caster and/or target, so it's really hard to say.
(Spells that age a target reduce life span by X amount of years for every 100 years of maximum lifespan the target race has (rounded to the nearest hundred), so a human who was affected by haste (3rd) would age 1 year, while a gnome would age 5).
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40-50 would be around 125 or so for a gnome.
On the other hand, several spells age the caster and/or target, so it's really hard to say.
(Spells that age a target reduce life span by X amount of years for every 100 years of maximum lifespan the target race has (rounded to the nearest hundred), so a human who was affected by haste (3rd) would age 1 year, while a gnome would age 5).