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A cracked, irritated or fissured foreskin could be due to a number of reasons.
If you have diabetes mellitus, both diagnosed or undiagnosed, it could cause a fungal infection of the foreskin leafing to cracking.
If you are not a known case of diabetes, you must get your blood glucose level checked and keep it under strict control. You may use topical antifungal like Miconazole to treat it. Consult your specialist doctor, discuss with him or her and with their consent take the medicines.
Also, you need to keep the area clean and dry.
Use lukewarm water to clean and avoid friction until it heals. This should work.
It could also be inflammation of the foreskin and the glans which can lead to fissuring and it is common in uncircumcised men.
Given your age, diabetes mellitus is a likely cause. Please check your blood glucose level.
If all else fails, you may need prescription steroid cream or lastly a circumcision.
For more information consult a family physician online --> https://www.icliniq.com/ask-a-doctor-online/family-physician