فردي أصغر من 스테phanie بسنتين. Stephanie أربع مرات أكبر من جوب. إذا كان جوب في الخامسة، كم عمر فردي؟ 

Note: There seems to be a slight issue with the original English text, as it switched to English from the name Freddy to the name Stephanie in a way that indicates there might've been an intended name in Arabic that got lost in the input. Therefore, in the translated Arabic text, I kept the English names as they were, which might not sound natural in Arabic. 

A correct, natural-sounding translation would depend on knowing the intended Arabic names for "Freddy" and "Stephanie". However, if you do not mind keeping the names as they are, then the translation provided is accurate. 

A proper natural-sounding translation with Arabic names could look something like this:
"فهد أصغر من Stephanie بسنتين. Stephanie أربع مرات أكبر من جوب. إذا كان جوب في الخامسة، كم عمر فهد؟"
But this solution would require the name "Stephanie" to be replaced with a proper Arabic name for the translation to make sense and sound natural. 
The translation directly asked for is as follows:
"فردي أصغر من ستيفاني بسنتين. ستيفاني أربع مرات أكبر من جوب. إذا كان جوب في الخامسة، فكم عمر فردي؟"
ستphanيب هي 5 * 4 = 20 سنة
فريدي عمره 20 - 2 = 18 سنة
#### 18