During an inspection in Parker Colorado, for my company, Magpie Property Inspections LLC, this roof was observed. Normally, a wood roof is not walked upon during an inspection as it can cause damage to the shingles, but in this case the owner requested I check the roof from on top. The home is approximately 20 years old and the shake shingles are showing a great deal of wear. Some are split and or missing. This roof may still be repairable, although the cost and difficulty to repair this many damaged shingles makes it a borderline case for replacement. In this case, we recommended the roof be replaced to our client prior to sale as the un-repaired areas of the roof will likely continue to deteriorate rapidly at this stage. In many cases, In many cases, wood roofs can be repaired and the roof certified against leaks for 5 years by a qualified roofer.