Complete Guide to Crochet Shorts Construction

You'll Need:
Blue yarn of middle weight;
Crochet hook size 2.
Instructions
Back
Make 26 chain stitches for both shorts legs and complete 2 rows with single crochets. Continue working with an alternation of 1 row of double crochets and 1 row of single crochets, making increases from the inner side every 2 rows - 2 x 1 stitch = 28 stitches.
At a height of 4 cm, connect the stitches of both shorts legs, casting on 5 stitches between them, resulting in 61 stitches in total. Continue to work in the same manner.
After 18 cm, create a row of holes for the cord: 1 double crochet, *1 chain stitch, skip 1 stitch of the previous row, 1 double crochet*; repeat from * to * to the end of the row, then make 3 rows with single crochets. Finish working at a height of 24 cm.
Front
Make in the same way as the back.
Assembly
Make seams. Insert the cord into the holes at the upper part of your shorts and fasten the ends with knots.
This pattern is for how many years?