Let's solve this problem step-by-step.
We are given that Josh is 5 years older than Ava, which means that if we let Ava's age be represented by x, then Josh's age would be x + 5.
The problem also tells us that the sum of their ages is 103. So we can set up the equation:
x + (x + 5) = 103
Now we can simplify and solve for x:
2x + 5 = 103
2x = 98
x = 49
Therefore, Ava's age is 49 years.
Hence, the answer is: Ava is 49 years old.